Water is necessary for carrying nutrients to your cells, flushing bacteria from your system, preventing dehydration, and replacing fluids lost from sweating, but you may not need to drink as much as you thought.
Stephen R. Daniels. pediatrician. No. You shouldn't give your newborn water or sugar water. And if you're feeding powdered or concentrated formula to your baby, never dilute it with more than the amount of water called for on the label. Your infant will get all the necessary hydration from breast milk or formula.
There are different ideas swirling around out there on what the appropriate age is to give babies water. What it all boils down to (pardon the pun) is this: do not offer water before 4 to 6 months of age, unless your doctor specifically recommended for a health concern.